Progress and Trepidation
After looking through the
Lippisch P13a by dr. Looping Looie thread I noticed he used a paper copy to test CG. I thought, "Great Idea!" so I printed the K-12 out on A4 paper, and started cut and folding, here's the result.
I tested it in the office, testing it in the hallway. Sadly it had a tendency to roll and float upside down. I had only a few "Meh" glides, then added the wing tip rudders, and adjusted... it didn't seem to have much yaw effect at that size I didn't expect much. Then added Aileron Flaps and adjusted, but still wasn't able to stop it from flopping over.
I was able to learn the CG was narrowed down it's location to 1/8" to 3/8" just in front of the back vertical leg of the spar box.
It's funny how this is Exactly where the Bomb Bay is.
But I couldn't manage a consistent glide. It nearly always flopped over, and or spun under. That was pretty cool.
OK I think I have 2 bad 12A escs and 1 bad 20A escs. They'd power up and go through the beep cycle but throttle up yields twitching. So I spent last night testing, re-flowing., re-soldering etc. Still bad (maybe). So while the solder joints are definitely good, I decided to pull out the un-opened 12A escs from a quad, where I replaced the stock 12A's with 20A Aikons. Soldered up the Bullets, and XT60, shrink wrap and the test on both are solid. I also pulled out a 30 Cheap ESC for the 2812 center motor for the flying Sub. Although I think I might switch up to the C-pack motor as I can set it up with a shaft in front and one in back. lending for perfect motor for propeller or water screw drive from the same source.
I have a little Time. I will have the water screw shaft in for show. For the air flights. wither way is good for air-worthiness testing.